Advertisements
Advertisements
प्रश्न
The inner circumference of a circular track is 264 m and the width of the track is 7 m. Find:
(i) the radius of the inner track.
(ii) the radius of the outer circumference.
(iii) the length of the outer circumference.
(iv) the cost of fencing the outer circumference at the rate of ₹50 per m.
Advertisements
उत्तर
Inner circumference of the circular track = 264 m
(i) ∴ Inner radius (r) = `"C"/(2π)`
= `(264xx7)/(2xx22)=1848/44` = 42 cm
(ii) Width of the track = 7 m
∴ Outer radius (R) = 42 + 7 = 49 m
(iii) Outer circumference = 2πR
= `2xx22/7xx49` = 308 m
(iv) Rate of fencing = ₹50 per metre
∴ Total cost of fencing outer circumference = ₹50 × 308 = ₹15,400
APPEARS IN
संबंधित प्रश्न
In Fig. 6, find the area of the shaded region, enclosed between two concentric circles of radii 7 cm and 14 cm where ∠AOC = 40°. (use `pi = 22/7`)
Find the area of the sector of a circle whose radius is 14 cm and angle of sector is 45º
In the given figure, ∆ ABC is a right-angled triangle in which ∠ A is 90°. Semicircles are drawn on AB, AC and BC as diameters. Find the area of the shaded region
Find the area of trapezium whose parallel sides are 11 m and 25 m long, and the nonparallel sides are 15 m and 13 m long.
The area of an equilateral triangle is `49sqrt(3)` cm2 . Taking each angular point as centre, circles are drawn with radius equal to half the length of the side of the triangle. Find the area of the triangle not included in the circles. [Take π = 1.73]
The area of a circle is 49 π cm2. Its circumference is:
There are two circular gardens A and B. The circumference of garden A is 1.760 km and the area of garden B is 25 times the area of garden A. Find the circumference of garden B.
The diameter of a cycle wheel is `4(5)/(11)"cm"`. How many revolutions will it make in moving 6.3km?
The radii of the two circles are 19 cm and 9 cm respectively. The radius of the circle which has a circumference equal to the sum of the circumference of two circles is ____________.
The distance around a circle is its ______.
